Abstract

Analytical expressions for soil stiffness for a group of piles were obtained for both plane strain and three dimensional conditions. A comparison between these two expressions revealed that a concept of a Winkler soil model could be applicable to pile group problems for the frequency range higher than the fundamental natural frequency of the soil deposit. A simple solution of dynamic pile group response was developed using a Winkler soil model extended to pile group problems and a transfer matrix method. Natures of dynamic group effect were studied for various cases. Using a simple structure supported by a pile group, it was demonstrated how the dynamic conditions in a group effect affects dynamic response of a pile-supported structure.

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